Blade-fastening.



UNITED snares PATENT onnron MAX BUTTER, ()l MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLlS-CHALMERS COMPANY, OF

MILWAUKEE, WISCONSIN, CQRPOR-ATION OF NEW JERSEY.-

BLADE-FASTENING.

Specification of Letters Patent.

- Patented Dec. 31, 1907.

Application filed October 29 1906. Serial No. 341,081. Renewed May 27. 1907- Serial No. 375,960.

To (1U whom it may concern:

Be it known that 1, MAX ROTTER, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful improvements in Blade-Fastenings, of which the following is a specification. I

This invention relates to fastening devices for the blades of fluid propelled engines, or for the blades of fans or pumps for propelling a fluid, and generally it relates to a fastening means which iscapable of being used in any relation where it is desirable to firmly secure a plurality of somewhat similar elements to a member.

This invention relates specifically to that class of devices, as steam turbines, for example, where a plurality of blades or similar elements are assembled in a holding member and are then securely fastened within a recess provided by the blade-carrying member.

It is common in steam turbines, for example, to provide a holding member for a plurality of bladeswhich is seated in a recess provided by the blade-carrying member, and the holding member and blades are then firmly secured in said recess by a separate calking member, piece or 'strip which is forced into said recess.

WVith the construction just stated it is not always possible to be sure that the blades or v the holding member are firmly seated Within the recess and retained against the bottom .thereof.

It is the purpose of this invention to provide a structural arran ement of the parts so that steam turbine blades, for example, may be held in a holding member, the blades and holding member, either before or after being assembled, may be seated in a recess of the blade carrying member, and the calking strip when forced into position willpositively seat the blades and the holding member se-I curely in said recess and against the bottom" thereof so that the position of the holding member and blades within sai recess with respect to the bottomof said recess, will be accurately determined during the process of inserting and drivin home the calking strip.

It is a further ob ect of this invention to provide the blade-holding member with a projection which is adapted to hook into an undercut portion provided in the recess, said projection engaging directly with the bladein steam turbines. -v1ded with a recess-'2 which is undercut on carrying member whereby security is afforded against displacement of the parts either while a calking' member is being driven homeyor during the subsequent use of the apparatus.

In the accompanying; drawings which form a part of this specification and on which the same reference characters are used to indicate the same elements in each of the several views,Figure l is a perspective of a fragment of the several parts embodyin this invention. Figs. 2 and 3 are vertica sections of structural arrangements embodying this invention.

The reference. character 1 represents a blade-carrying member, and in this connection it may be stated that the terms bladecarrying member, blades, holding members and talking strips, as used in this specifica tion are used in a generic sense and are not intended to confine this invention to any specific art, the specific terms used being used as a matter of convenience, as this specific structure is particularly adapted for use The member 1 isproone side either by a dovetailed section extending the full depth thereof, as at 3 on Fig. 1, or extending only part way of the depth thereof, as at 4 on Fig. 2, or which is but a plain recess, as at 5 on Fig. 3.

'lhe numeral 6 represents a blade-holding member which is adapted to retain a plurality of blades 7, these blades being inserted in slots out in said member, or otherwise formed, and the blades have their roots which are inserted in said slotsso formed in any preferred way that they are locked against endwise removal from said bladeholding member when said blade-holding member issecured in the recess 2 This object is attained with the blades illustrated by the drawings 'by making one ed e of the blade-inclined, as at 8, which inclihed edge of the blade fits closely against the corre, spondingly inclined face of the slot 9 in the blade-holding member 6.

As shown by the drawings, the bladeholding member 6 is either provided with a projecting dovetailed portionlO, as shown by Fig. 1, or a dovetailed portion 11, as shown by Fig. 2, or a simple projecting offset 12, as shown by Fig. 3, the dovetailed or offset portion in each' instance being 2 erases adapted to seat in the undercut side of the re- 2 and thereby prevent the withdrawal. of said blade-holding member.

it is preferred that the roots 13 of the blades shall extend entirely through the blade-holding member so as to be seated against the bottom of the recess 2, but this is only for the purpose of the additional security offered by'the increased depth of the roots of the blades, and such a construction is a feature which is not an essential part of this invention. I

The blade-holding member 6 is provided with a projection 14 located preferably at the base of said blade-holding member and located on the side opposite to the projections already referred. to. 15 represents a call;- ing strip in its final position, and it will be readily seen that when the blade-holding member 6 and the blades are assembled and seated in the recess 2 with the projections shown at the left hand of each of the several in their correct relation.

The blade-carrying member 1 may be provided in the side of said recess adjacent to the (walking strip 15 with a head or depression 17, into which a part of the material of the calking, strip is forced, as at 18, thereby .lirmly locking the calking strip and the associated parts ln-place; the provision. of such a bead is not, however, absolutely necessary, but it ailords positive protection against displacement of the parts.

\Vhat I claim is,-

1. The combination with. a blade-carrying member provided with a recess having one side undercut of a blade-holding member, blades interlocked with said blade-holding member, said blade-holding member being;

provided with a projecting portion adapted to be engaged directl; with said side within the undercutportion thereof.

2. The combination with a blade-carrying member provided with a recess having one side undercut of a blade-holding member,

provided with two'projecting portions one of which is adapted to be engaged directly with. said side within the-undercut portion. thereof. and a calking member adapted to rest upon the other of said projections and retain the blade-holding member within the recess of the blade-carrying member.

4. The combination with a blade-carrying member provided with a recess having one side undercut of a blade-holding member, blades interlocked with said blade-holding member, said blade-holding member projecting Within the undercut portion of said side and being provided with a projecting portion upon which is adapted to bear a (talking member, and said calking-member.

In testimony whereof, I affix my signature in the presence of two Witnesses.

MAX. no'rrnn.

WVitnesses FRANK E. DENNETT, G. F. DE WEIN. 

